Nathan w



July 31, 1928.

N. W. PERKINS ET AL ADDING AND SUBTRACTING ACCUKULATOR Filed Oct. 19, 1926 I5 Sheets-Sheet l N. W. PERKINS ET AL ADDING AND SUBTRAC'IING ACCUHULATOR 3 sheets-fih eet 2 Filed Oct. 19, 1926 lullllllll lllll l\|| July 31. 1928.

July 31, 1928. 1,679,265

N. w. PERKINS ET AL ADDING AND SUBTRACTING ACCUMULATOR Filed Octl9. 1926 3 Sheets$heet 3 Patented July 31, 1928.

UNITED ST ES PATENT OFFICE.

NATHAN W. PERKINS, OF EAST OR ANGE, AND EMIL JOHN ENS, F NEWARK, NEW

JERSEY, ASSIGNORS T0 ELLIS ADDING TYPEWRITER COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION-OF NEW JERSEY.

ADDING AND. SUB'TRACTING ACCUMULATOR.

7 Application filed qctober 19, 1926. Serial No. 142,580.

Our invention relates to a combinedaddingand subtracting accumulator for calculatingfmachin es and is an improvement on the addin'gand" subtracting accumulator set 6 forth in the patent to Halcolm Ellis No.

1,203,863, dated November 7 1916.

' In the Ellis patent aforesaid a single set of accumulator wheels which are adapted to be actuated by racks whose extent of 10 movement is determined by the setting of the keys on the keyboard is .used both for addition and subtraction. In the construction covered by that patent, ca"-rying is effected by using a pivoted, reciprocatory carrying detent movable in one direction or the other to carry during an adding or subtracting operation, as the case may be. i

The Ellis patent discloses two controlling mechanisms, one foraddition, and the other for subtraction. These two controlling mechanisms in practice assume the form of an adding cam plate and a subtracting cam plate. A shift bar is set in one positionor the other for the purpose of blocking or locking out that one of the twolcontrolling devices or mechanisms which is not to be used. The shift bar constitutes a selective means for locking one of the controlling mechanisms without interfering with the other one of them.

The aforesaid patent also shows combined with the shift bar an adding hook and a subtracting hook, respectively under spring tension and they, also, are selectively released or locked. They are adapted to cooperate with the double cams on the accumulator wheels and with the adding cam plate and subtracting cam plate.

Our object is to provide a single controlling mechanism which will serve the purpose of the two controlling mechanisms comprising the adding cam plate and the subtracting cam plate of the Ellis Patent No. 1,203,863 but to retain the adding hook and the subtracting hook, and the reciprocatory detent. I

With this object in view we have devised a. single cam plate having means adapted to co-operate with both the adding hook and the subtracting hook so that either of said hooks may perform its functions, accordin to the getting of the shift bar. Our improved by the improved single cam :proved single cam plate,

of the accumulator may I reciprocatory detent.

cam' plate also co-operates with the reciprocatory'or swinging detent of the aforesaid Ellis mechanism to the end that said detent will be swung in one direction or the other plate we have provided, according to the setting ofjthe shift bar. Thus, by the use ofone controlling mechanism instead of twocontrolling mechanisms, that is by the use of an imall of the functions be obtained, with simplification of the mechanism, lowering of the expense of manufacture and assembly, and otherwise improving the accumulator.

The improved single controlling mechanism or cam plate which we have devised is provided with a cam slot or controlling cam surface to co-oper'ate with the pin on the In practice, this cam slot or outline is made in the general outline of a Y ora modification thereof. The swinging of the pin of the reciprocatory detent or carrying device into one or the other of the branches of the cam slot enables the detent to be swung in one direction for caring during an adding operation, or in the other direction for carrying during a su tracting operation.

\Ve are also aware that a pin might be provided on the single cam plate and that the slot or cam surface could be provided on the reciprocatory detent, a reversal of the construction we have disclosed.

For the purpose of swinging the single controlling cam plate in one direction or the other, there is provided a shiftable bail which is connected by independent springs to the pins or studs on the diiferent swinging detents. The translation or movement of this hail from one position to another brings about the shifting of the parts.

The shiftable bail may be pivoted, or it may be slidably mounted. In either instance, this bail is shifted, through appropriate connections, by operating the rockable shift bar of the Ellis machine.

Furthermore, while we prefer to provide a Y-shape slot in the single cam plate, nevertheless if the springs which connect the bail to the respective reciprocatory detents are of Sufficient strength to prevent play, it is not necessary that the cam slot be of Y=shape as it may be in the form of a slot having no entrant )art although such slot is of sulficient vvi th to permit shifting of tlie-f'pinso that the same result will be Obtained.

Practical embodiments of the invention areset forth hereinafter and sh'ow-n in th accompanying drawings in which: 1 Figure 1, is a section through the accumulator; H p F ig. 2, is a plan view;

cam plate which we'lia've inv ntd'z F s fince g v ew. a e Pla F vis ew. k F l hPW nga modification, certaiirparts om tted: {or

ftheisake ofelearnessjland ig. 6, is' a vie\v likc Figi 3, show i=n g -a modifiedfform of Y "slot. i. J .Fis. a d v w i dl e wn shown iniF' 6. i

ftie'fer ence is to be to {the No. l03,863-.f0r -a disclosure ofielementsanli mechanisms related to our combined adding and substractmg accumulator, as we have only illustrated those .parts of the accumulator found in the said Pate'nt 1,203,863 iv hich are directly related to .our present improvements. i i

The frame which; carries the. accumulator section comprises {plates .connected, 2 by rods N4.

The svviiigingaccumulater iriame appears at N,b ein pivoted ariduloperated in-a manneriwhieii 'b e cleari fronithe said I Ellispatent.

The shaft \vhich carries the accumulator wheelsN5O is, shown at N2. Each accumulator wheel, except the hi' hest of the series, carries a't\vo-pointed cam-N51.

It. will be understood that Fig. 2 is broken away and onlv shows certain ones of the accumulator wheels.

The accumulator frame 50N swings on the shaft N5.

The adding hook appears in each instance at N and the subtractinglhook in each instance is shown at N61. For a disclosure of detail views of these hooks, reference is to be had toFigs. '34 and 36 of N 0. 1,203,863.

The springs which actuate the hooksNGO and N61 are shown atNSfi/ v The reciprocatory detent or carrying device which is movable inone direction for effecting carrying durin an addingo'peration appears at N54, hemg-pivotedgto the frame N53 at N16. In Fig. 1 theaccumulatorframe andthe accumulator Wheels -are shown "inhbrnial position, cam N51' being at the zero position, one of the points thereofabutt-ingthe adding'hook each instance. The hooks N60 and N61 are pivoted on shaft N3. The shift bar isshown at N90. The hook the two canrplates in. question. --oted fat N15 and isfprovided with a "oam fslot appearing -at YS (Figs. 1, 3, 4) or [N13 which projects .from the detent. pin is adapted to pass into either of the ihranchesB, B of thecam slot YS' or from N60. the detent N54 being'inengagement with the accumulator Wheel, in

N60 has the projections a and w, and the hook N61 has the projections Z1 and 1 Reference is to be 'hadto the aforesaid Ellis Patent 1,203,863 for a disclosure of the parts previously, specifically descrihed.

Figs. 35 and 37 of said Ellis patent are used to control theskfihging of the reciprocatory Fig. 3, is adetail sideyiew of the single carrying device or detent N 54.

Our improvements eliminate the adding and subtracting cainplates shown in Figs.

controlling Figs/3 aud t or as 6. Thiscani plate serves t-he functions of It is piv- Y-shaped a cam slot of modified form such as appears at 'YSS, Fig. 6.

The said slot receives pin one side to the other side of the wide part of the-slot YSS, if a'slot such as shown in Fig.

6 be used. Each cam plate N257, is actuated by a springNST.

Referring first to Figs. 1, 2,3, to determine'the branch, B, or B, which will be 'selected, there' is provided a selective bail 73N which is pivoted at one end at 116N and 1. at the-other end at NQON. 'frame appears at N45.

The ba'iI T li is conncctedto the respective studs or pins N13 of the various detents N54 by springs S.

'Referring now to Fig. 6, if the tension of the springs S is made heavy enough, the slot in cam plate N257 may he of the shape shown at 'YSS becausethe'tension-of the springs willbe sufficient to hold the pins N13'against the outline or margin of said slot YSS. "hich is of the same general outline as the slot' YS, except that thecpart which projectsintothe slot is omitted. 'e also wish it understoodthat the stud N13 could lie-provided on the'comhined adding and subtracting cam plate N257 and that the cam slot YS YSS might heprovided on the detent. N54.

' "The'bail carries a stud N21N which is con- It is notnecessary to employ a bail 73N which is pivoted, as'any mounting enahling the hail to shiftwill serve the purpose.

For instance, in Fig. 5 the end plates and one or more of the intermediate plates N53 are provided with guiding upper edges, and

thebail 73N is slidably mounted on said This "Ai part of' the guiding edges, said bail being provided with arms or links N7 5N which are directly pivoted at N22N to two cranks 76N fastened to the ends of the shift bar N90, one of said cranks appearin in Fig. 5, the other one not being shown. prings S which connect the bail 73N to the respective pins N13, as in the construction shown in Figs. 1 and 2, hold the bail against the tops of the plates N53.

he projections a and b on the 'adding hooks N60, N61"'co -operate with the shift bar N90 in the manner set Patent No.- 1203,5363.

"he projections 10,3 on the hooks N60, N61 co-operate with parts at and z ofithe cam plate N257. 1

According to the setting ofthe shift bar N90, one of the hooks N60, N61 will be locked out while the other .of said hooks will be free for action. Theturning of the shaft of the shift bar N90 positions the bail 73N at one side or the other of the dead center and consequently the tension of the springs S will shift the detents N54 in one direction or the other to effect carrying during an adding operation or during a subtracting operation.

Thus, the single. cam'plate N257 performs all of the functions of both the adding cam plate and the subtracting cam plate of the Ellis Patent 1,203,863. i

Operation-As ShOWIl-iI1'-Fig$; :1 and 5, the parts'are in position for the performance of addition, the accumulator being .clear.

Vhen the mechanism is tripped, the single cam plate N257 swings on its pivot N15, causing detent N54 to move a distance of one tooth, thereby advancing the accumulator wheel N of the next higher order in the series of wheels, a distance of one tooth, thus effecting transfer or carrying.

This action will occur either when the mechanism is set for addition, or when it is set for subtraction.

\Vhen the shift bar N90 is turned in one direction, it frees one of the hooks N60, N61, enabling the spring of that hook to snap it into position for co-operation with the trip cam N51, said shift bar at the same-time locking the other hook in inoperative position. When the shift bar is turned in the opposite direction, it frees the other one of the hooks N60, N61 for co-operation with the cam N51 and locks the remaining hook in inoperative position.

As shown in Figs. 1 and 5, the shift bar N90 is set to condition the accumulator for addition, said bar then engaging the shoulder or lug b of the subtracting hook N61 and holding said hook back against the tension of its spring so that its point or tooth cannot be engaged by the trip cam N51 on wheel N50. The adding hook N being now freed from restraint by the shift bar N90, its spring N86 positions said adding the tooth of trip cam N51.

by its spring N87, causing forth in the Ellis hook N60 sothat its-point is in the path of At the proper N51 can wipe against the point on the end of the addinghook N60, press it back and disengage its lug w from the part w-on plate N257, thus releasing the cam plate N257 which thereupon is shifted detent N54 to turn the wheelN50 of the-next higher order a distance of one tooth, thus effecting carrying or transfer.'

When the shift bar N90 is turned in the time, the trip cam opposite direction, it lug b of subtrae'tinghook N61, whereupon thespring-N86 for said hook snapsit into position where its point will lie in -thepath of the tripping cam N51, and saidbar N90 then engages the lug a onradding hook N60, pushing back to inoperative position. Carrying may then take place; during a subtracting operation, when the subtracting hook N61 is tripped by cam N51, because the tripping of the hook N61 will disengage its lug y from the part' a of the cam plate N257 which will then be snapped by its spring N87, causing the detent N54 to be shifted a distance of-one tooth in a direction the'reverse of that taken by said detent N54 when carrying during an adding operation.

As previously explained, the turning of the shift bar N90 sopositions the bail 7 3N that th'e springs S will shift all of the detents N54 in the proper'dire'ction to effectcarrying during an adding or a subtracting operatiOn. I a i The accumulations are stored in the wheels N50 by the usual racks of the Ellis machine, and the parts co-operate 'with,'and'are restored by, a restraining bar, as disclosed, respectively, at R50 and N49, Ellis Patent 1,203,863.

Similarly, the frame 50N which carries the accui'nulator wheels N50 is lowered and raised in the same general-manner as set forth in said Patent 1,203,863.

What we claim is:

1. In an adding and subtracting mechanism, the combination with accumulator wheels, of a reeiprocatory carrying device for each accumulator wheel, and a single, rockable adding and subtracting controlling mechanism for each wheel adapted to co-operate with the carrying device thereof to shift it in one direction or the other, whereby carrying may be effected either in an adding or a subtracting operation.

2. In an 'adding and subtracting mechanism, the combination with accumulator wheels, of a reciprocatory carrying device for each occumulator wheel, a single, rock able adding and subtracting controlling mechanism for each wheel adapted to cooperate with the carrying device thereof to shift it in one direction or the other, whereby carrying may be effected-either in an disengages from the ing maybe efl'ecte-d eitherin'an adding or a subtracting operation, and se lective means for determining the-action of said combined-adding and subtracting controlling'mechan'ism.

3. In an addingm'n'd'subtractingmechanism, the combination with accumulator wheels, ofareciprocato'ry carrying device for each accumulator wheel, and a combined adding a'n d subtracting controlling mechanism=for each wheel 'adapted to co-operate with the carrying device thereof'toshift it in one direction or'the other,'whereby carryadding or a subtracting operation, and selective means for determining the aetion-of-said combined adding and-subtracting controlling mecha- 'nis'm comprising a niovably mounted member, springs'a'connecting said member to the respective-r-reciprecatory carrying -devices, and means forshizftingsaid 'movably mount- "ed 1 member to-chan ge the position ofthe springs fontheirpurpose of changing the direction of travel' ctr-the 'rccip'roc-atory carryingdeviees when sa'id rcciprocatory devices are-.freed-rl orraction.

than add-ingcand subtracting mechanism, the coinbination with accumulator Wheels, of a-reoiproc2itory carrying device for each-accumulator Wheel, a combined add- 'ing and subtracting controlling mechanism for each wheel adapted to "cooperate with the carryingdevice-thereof; toshift it to' one direction or the other, whereby carrying may be effected either in anaddingor a subtracting operation, and selective meansfor determining the actionof said combined adding and' subtracting controlling mechanism com prising a shiftable-bail, springs connecting the bailto the respective reeiprocatory carrying devices, said springs being adapted to mox e when the bail is shifted to thereby determine the direction of pull on the reciprocatory carrying devices and hence the direc tion of movement of said reciprocatory carrying devices when-said devices are freed, and means for determining the action of said bail and said combined adding and Subtracting control-ling mechanis- 5. In an adding and subtracting mechanism, the combination with accumulator wheels,'of a'reciprocatory carrying device for each accumulator wheel, a single mova-ble combined-adding and subtracting controlling member having a camming connection to the reciprocatory carrying device which enables said carrying device to be shifted in one direction for 'a'ddition and in the opposite direction for subtraction, and selective means fondetermining the direction in which the-reciprocatory carrying device will move. v

(3. In am adding and subtracting mechanism, the combination with accumulator wheels,'of a reciprocatory carrying device for each accumulator wheel, a single movable combined 'adding'and subtracting controlling member having-a camming connection to the reciprocatory' carrying device which enables said'carrying device to be shifted in one direction for addition and in the opposite direction for subtraction, and selective means for determining the direction in which the reciprocatory carrying device will move comprising a shiftably mounted member, coil springs" connecting said member to the respective reciprocatory ca'rrying devices, andmeans which determines the action of said shiftable member and said combined adding a'ndsubtracting controlling mechanlsm.

7. In an adding and subtracting mechanism, the "combination with accumulator wheels, and a reciprocatory carrying device for each wheelyof a pivoted cam plate having a cam co-operating with said reciprocatory carrying device in each instance, the cam of said cam plate being adapted to'effeet shifting of said reciprocatory carrying device inone direction or the other to cause carrying either in addition or subtraction, and means 'for selectively determining-the action of each of said cam-plates. v

8. 'In an adding and subtracting mecha nism, the combination "with-accumulator wheels, and a reciproeatory carrying device for each wheel, of a pivoted Cam -plate having a' cam co operating with said'reciprocatory carrying'dev'ice'in each instance, the 'cam of said cam plate beingadapted to effect shifting of said 'reciprocatorycarrying "device in onedirection 'or theother 'to' cause carrying either in addition or subtraction, a swinging bail, independent coilsprings connecting said bail to the respective reciprocatory carrying devices, and selective means co-operating with the'respectii e cam-plates and with the bail to determine the position of the bail and of the springs and the action of the cam plates.

9. In an adding and subtracting-m'echa nis'm, the combination with, accumulator wheels, of a recipro'catory carrying device for each wheel, a plurality of swinging plates, each having a Y-sliaped cam slot receiving a part of the 'reciprocatory carrying device, a bodily shiftable member, independent coil springs connecting said member to the respective recip'rocatory carrying devices, and-means for selectively determining the shifting of said member and the 'action' of said ca'm plates whereby the direction of pull of the springs on the reciproca- -tory' carrying devicewill determine the direction in which said devices will move when freed.

10. In an adding and subtracting mechanism, the combination with accumulator wheels, and a reciprocatorycarrying device for each wheel,'of a combined adding and subtracting controlling member for each reciprocatory carrying device, said members having camming connection with the respective carrying devices, spring means c0-operating with the reciprocatory carrying devices, said spring means being operable to move the carrying devices in one direction or the other, and selective means for detertrolling means.

In testimony whereof we ailix our signatures.

NATHAN W. PERKINS. EMIL J. ENS. 

